What’s Under the Hood
This part of the computer physically holds all internal components.
Case (chassis)
This older internal power connector is often found on legacy hardware.
Molex connector
This USB connector is most commonly found on computers and chargers.
USB Type A
This Apple-developed connector replaced the 30-pin dock connector.
Lightning
This video cable is commonly used with TVs and game consoles.
HDMI
These ports are usually found on the front of a PC for easy access.
USB and audio ports
This type of electrical current is required to run computer components.
Direct current (DC)
This USB version is often associated with blue-colored ports.
USB 3.0
This interface can function as USB and a display connection.
Thunderbolt
This display interface is preferred for multi-monitor PC setups.
DisplayPort
This metal plate lines up motherboard ports with the back of the case.
I/O shield
On a Molex connector, this wire color is associated with the highest voltage.
Yellow
This USB connector is reversible and used by most modern devices.
USB-C
This Thunderbolt version introduced the USB-C connector.
Thunderbolt 3
This measurement affects how smooth motion appears on screen.
Refresh rate
These covers help prevent dust and interference when expansion slots aren’t used.
Blanking plates
This newer power connector replaced Molex for most modern storage devices.
SATA power
This USB standard can support high-speed data, video, and power through one cable.
USB4
This symbol helps identify whether a USB-C port supports Thunderbolt.
Lightning bolt icon
This display technology allows each pixel to produce its own light.
OLED
Leaving gaps in a PC case can increase interference from this invisible electrical energy.
Electromagnetic interference (EMI)
Using open gaps in a PC case can increase risk from this electrical hazard.
Electrostatic discharge (ESD)
This USB feature allows a single cable to charge laptops instead of just phones.
USB Power Delivery
This Thunderbolt version maintains 40 Gbps but improves minimum performance standards.
Thunderbolt 4
A 120 Hz monitor helps reduce screen issues when playing 60 fps video because of this relationship.
Refresh rate divisible by frame rate